Board Thread:Pokémon Help/@comment-34271473-20180316234114/@comment-32358261-20180331032938

Well at 80 base power it a sacrifice of only 10 base power with a 50% effect rate. So that’s loads better compared to most moves which have a 10-30% effect rate.

So the difference would be very minimal all things considered. Personally I would choose fiery dance because even if the sp atk boost doesn’t activate, its not game changing. When it does happen though it can be a fairly easy sweep